/*

   Copyright 2001  The Apache Software Foundation 

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.util;

import java.util.HashMap;
import java.util.Map;

/**
 * This class contains utility functions to manage encodings.
 *
 * @author <a href="mailto:stephane@hillion.org">Stephane Hillion</a>
 * @version $Id$
 */
public class EncodingUtilities {
    
    /**
     * The standard to Java encoding table.
     */
    protected final static Map ENCODINGS = new HashMap();
    static {
        ENCODINGS.put("UTF-8",           "UTF8");
        ENCODINGS.put("UTF-16",          "Unicode");
        ENCODINGS.put("US-ASCII",        "ASCII");

        ENCODINGS.put("ISO-8859-1",      "8859_1");
        ENCODINGS.put("ISO-8859-2",      "8859_2");
        ENCODINGS.put("ISO-8859-3",      "8859_3");
        ENCODINGS.put("ISO-8859-4",      "8859_4");
        ENCODINGS.put("ISO-8859-5",      "8859_5");
        ENCODINGS.put("ISO-8859-6",      "8859_6");
        ENCODINGS.put("ISO-8859-7",      "8859_7");
        ENCODINGS.put("ISO-8859-8",      "8859_8");
        ENCODINGS.put("ISO-8859-9",      "8859_9");
        ENCODINGS.put("ISO-2022-JP",     "JIS");

        ENCODINGS.put("WINDOWS-31J",     "MS932");
        ENCODINGS.put("EUC-JP",          "EUCJIS");
        ENCODINGS.put("GB2312",          "GB2312");
        ENCODINGS.put("BIG5",            "Big5");
        ENCODINGS.put("EUC-KR",          "KSC5601");
        ENCODINGS.put("ISO-2022-KR",     "ISO2022KR");
        ENCODINGS.put("KOI8-R",          "KOI8_R");

        ENCODINGS.put("EBCDIC-CP-US",    "Cp037");
        ENCODINGS.put("EBCDIC-CP-CA",    "Cp037");
        ENCODINGS.put("EBCDIC-CP-NL",    "Cp037");
	ENCODINGS.put("EBCDIC-CP-WT",    "Cp037");
        ENCODINGS.put("EBCDIC-CP-DK",    "Cp277");
        ENCODINGS.put("EBCDIC-CP-NO",    "Cp277");
        ENCODINGS.put("EBCDIC-CP-FI",    "Cp278");
        ENCODINGS.put("EBCDIC-CP-SE",    "Cp278");
        ENCODINGS.put("EBCDIC-CP-IT",    "Cp280");
        ENCODINGS.put("EBCDIC-CP-ES",    "Cp284");
        ENCODINGS.put("EBCDIC-CP-GB",    "Cp285");
        ENCODINGS.put("EBCDIC-CP-FR",    "Cp297");
        ENCODINGS.put("EBCDIC-CP-AR1",   "Cp420");
        ENCODINGS.put("EBCDIC-CP-HE",    "Cp424");
        ENCODINGS.put("EBCDIC-CP-BE",    "Cp500");
        ENCODINGS.put("EBCDIC-CP-CH",    "Cp500");
        ENCODINGS.put("EBCDIC-CP-ROECE", "Cp870");
        ENCODINGS.put("EBCDIC-CP-YU",    "Cp870");
        ENCODINGS.put("EBCDIC-CP-IS",    "Cp871");
        ENCODINGS.put("EBCDIC-CP-AR2",   "Cp918");

        ENCODINGS.put("CP1252",          "Cp1252");
    }

    /**
     * This class does not need to be instantiated.
     */
    protected EncodingUtilities() {
    }

    /**
     * Returns the Java encoding string mapped with the given standard
     * encoding string.
     * @return null if no mapping was found.
     */
    public static String javaEncoding(String encoding) {
        return (String)ENCODINGS.get(encoding.toUpperCase());
    }
}
